yea, depression can be a bad thing and i know people at university who have had to take leave of absenses for depression. Go to a doctor and explain what's happening. Also, try not to wait on others calling you ot hang out. If there's a new film out of something, ask a group of people if they want to go see it, then maybe get a few beers? It all starts slow but over time, your friendship will grow. Good luck with everything dude.